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Mbx Biosciences (MBX)Director bought ~$12M

Patrick J Heron, Director at Mbx Biosciences, bought ~$12M of Mbx Biosciences shares.

~$12M
Approx. value · 667K sh @ $18.00
5.22M
Holds after · shares reported
Traded
Sep 26, 2025
Filed
Sep 30, 2025

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

  1. Sep 24, 2025Company filing · Form 8-K · Material agreementSigned an important agreement
  2. Sep 26, 2025 · this disclosureInsiderDirector purchased ~$12M of MBX shares in the open market

What came next

  1. Oct 31, 2025Company filing · Form 8-K · Results, Executive changeChanged a top executive or board member, and reported its results“On October 31, 2025, James M. Cornelius, a member of the Company’s board of directors (the “Board”) and the chairperson of the audit committee of the Board (the “Audit Committee”), resigned from the Board, including from his role on any committees, effective immediately.”
  2. Jan 11, 2026Company filing · Form 8-K · Results, Reg FDReported its results, and shared information with investors (and 1 more item)
  3. Jan 20, 2026Company filing · Form 8-K · Executive change, Reg FDChanged a top executive or board member, and shared information with investors“Effective as of January 20, 2026, the board of directors (the “Board”) of MBX Biosciences, Inc. (the “Company”), upon the recommendation of the Nominating and Corporate Governance Committee of the Board (the “NCG Committee”), appointed Laurie Stelzer as a director of the Company.”
View the official recordSEC Form 4

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Mbx Biosciences

For Mbx Biosciences, OQRO holds 5 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its MBX page.

Other recent filings by Patrick J Heron, Director

The full history of Patrick J Heron, Director is on the profile page.

How this filing works

Other disclosures at Mbx Biosciences

Everything OQRO holds on this company is on its MBX page.

This is one filing. OQRO holds the rest

Insider trades filed with the SEC, stock trades disclosed by members of Congress, fund holdings from 13F filings and federal contract awards, each one in plain words next to its official filing. On this page it opens why the trade stands out, what the company did around that time, the price since, and every field of the form.

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OQRO describes public disclosures and context calculated from them. It does not give personalized advice and does not recommend any transaction. How OQRO treats data